<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>在线尝试 Bootstrap 实例</title>
    <meta name="viewport" content="width=device-width,
                                     initial-scale=1.0,
                                     maximum-scale=1.0,
                                     user-scalable=no">

    <link rel="stylesheet" href="css/bootstrap.css">
    <script src="js/jquery-3.2.1.js"></script>
    <script src="js/bootstrap.js"></script>
</head>
<body>




<div class="container">



    <div class="panel-group" id="accordion">
        <div class="panel panel-default">
            <div class="panel-heading">
                <h4 class="panel-title">
                    <a data-toggle="collapse" data-parent="#accordion"
                       href="#collapseOne">
                        点击我进行展开，再次点击我进行折叠。第 1 部分
                    </a>
                </h4>
            </div>
            <div id="collapseOne" class="panel-collapse collapse in">
                <div class="panel-body">
                    Nihil anim keffiyeh helvetica, craft beer labore wes anderson
                    cred nesciunt sapiente ea proident. Ad vegan excepteur butcher
                    vice lomo.
                </div>
            </div>
        </div>
        <div class="panel panel-default">
            <div class="panel-heading">
                <h4 class="panel-title">
                    <a data-toggle="collapse" data-parent="#accordion"
                       href="#collapseTwo">
                        点击我进行展开，再次点击我进行折叠。第 2 部分
                    </a>
                </h4>
            </div>
            <div id="collapseTwo" class="panel-collapse collapse">
                <div class="panel-body">
                    Nihil anim keffiyeh helvetica, craft beer labore wes anderson
                    cred nesciunt sapiente ea proident. Ad vegan excepteur butcher
                    vice lomo.
                </div>
            </div>
        </div>
        <div class="panel panel-default">
            <div class="panel-heading">
                <h4 class="panel-title">
                    <a data-toggle="collapse" data-parent="#accordion"
                       href="#collapseThree">
                        点击我进行展开，再次点击我进行折叠。第 3 部分
                    </a>
                </h4>
            </div>
            <div id="collapseThree" class="panel-collapse collapse">
                <div class="panel-body">
                    Nihil anim keffiyeh helvetica, craft beer labore wes anderson
                    cred nesciunt sapiente ea proident. Ad vegan excepteur butcher
                    vice lomo.
                </div>
            </div>
        </div>
    </div>

</div>
</body>
</html>